[Smac-users] Number of Slots - Carrier sense delay

[John Heidemann]

On Mon, 04 Apr 2011 16:34:02 BST, Norberto Barroca wrote: 
>Can anyone explain to me how many slot the authors in “Medium Access Control With
>Coordinated Adaptive Sleeping for Wireless Sensor Networks”, used in the Carrier
>sense delay (That is the same of the contention window size). And what is de
>duration of every time-slot, since in Table 1 I only have the number of time slots
>used in the SYNCH and DATA phases.
>
>Carrier sense delay - is introduced when the sender performs carrier sense. Its
>value is determined by the contention window size.

You would have to look at the implementation to determine those
constants.
I recommend you look at the TinyOS version available at
http://www.isi.edu/ilense/software/smac/index.html
(that implementation is more complete than the ns-2 simulation).

And S-MAC has really been superseded by SCP-MAC.  The SCP paper at
http://www.isi.edu/~johnh/PAPERS/Ye06a.html
has a more careful description of carrier sense, I think.

   -John Heidemann